Rotary pump



Patented Oct. 7, 1919.

l I I Invnimn. 75Zm Fla Ford. W

J. F. FORD ROTARY PUMP.

APPLICATION FILED MAR. 23, I916. 1,318,319,

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' JOHN FLETCHER FORD, or HAWTHORNE, oAmronnIA.

ROTARY PUMP.

Specification of Letters Patent.

rammed Oct. 7, was.

Application filed March 23, 19%,, Serial No. 86,082.

, This invention relates to improvements in rotary pumps and has particular relation to pumps employing rotary pistons and generally having eccentric members for actuating the said rollers and the mechanism is especially adaptable to the pumping of water from wellsofvarious.depths...

a rotary pump in which an eccentric memberis moved for actuating a roller piston "mounted vin the pmnpcasing, the structure being sifch that one piston" ora plurality chamhtanfor receiving one or more rotary pumps, and having a partition for forming an inlet'chamber and-adischarge chamber outside the piston chambers, a suitable valve mechanism being provided for controlling the directions of the liquids passing through the pump.

7 It is a further object ofthe invention to provide an eccentrically operated roller piston pump in which the piston is so arranged that i rolls around in the pump thus eliminating much friction that would otherwise be developed and making it possible to construct the pump in a simple manner.

It is a still further object of the inven tion to provide a pump with one or more rollers adapted to. move about upon the inner periphery of the pumps walls to propel liquids through the pump, eccentric members being also provided for propelling the said pistons, the invention also including a gravity actuated valve adapted to engage the peripheries of the pistons to direct the liquids operated upon by the said pistons. With these and other objects in view the invention comprises certain novel constructions, combinations and arrangements of parts as wlll be hereinafter more fully described and claimed,

Iris an object of tl1e..invention.to-provide- In the accompanying drawing forming. a part of this specification:

Figure 1 is a vertical cross sectional view taken'through a pump constructed in accordance with this invention, and showing L ne of the pistons and valves in side eleva- Fig. 2 is a vertical sectional view taken upon the line 22 of Fig. 1.

In the said drawing. a preferred form of the mechanism forming thesubject matter of this invention has been disclosed, and, the details and features of the invention will now be more specifically set forth, ref-- erence being had 139 said. illustration.

In the said drawing 5 indicates a pump cylinder, the ends of which are closed by end walls 6, the lower portions of which are mounted upon suitable standards 7. While the pump may use only one piston, it is usually 'flpreferable to employ two or more piston'sfand the drawing sets forth a pump in which two pistons are used, the pumn cylinder being divided by a ,vertical partition 8 for this purpose. A shaft 9 extends through the pump cylinder and finds bearings at 10 in the walls 6 thereof, packing or stufling boxes 11 being also provided to prevent leakage at said bearings. Within the walls 6 and between them and the central circular partition/8, eccentrics 12" and 13 are fitted, andv fastened upon the shaft 9 usually by means of keys 14 so that the rotation of the said shaft will cause a rotation of the eccentrics also. In a two piston pump the ecefitrics are set diametrically opposite each other as clearly shown in Fig. 1 of the drawing. Mounted upon the eccentrics 12 and 13 are roller pistons 15 and 16, the said pistons having a central bearing closely fitting upon the peripheries of their eccentrics, while each piston is made of a suitable thickness outside the eccentrics so that it will ust fit between the highest point of its eccentric and the inner surface of the cylinder 5. It will be-readily understood by reference to Fig. 1 of the drawing that as the eccentrics turn' with the shaft, the pistons are rolled upon the inner surface of the cylinder walls always filling the space opposite the longest radius of the eccentric entirely around the path of its movement. A reference to Fig. 1 will also show that a space is left at other points between the peder walls, adjacent to said ports and an auXil-,

iary pump casing 19 is arranged to inclose the said partition and also to leave an ample space outside the same to accommodate a valve 20 which directs the movement of the liquids propelled by the pump. The said partition 18 forms within it an inlet chamber 21, while between the said partition and the walls of the auxiliary casing 19. an outlet or exhaust chamber 22 is afforded, within which chamber the valve 20 is movable. Connecting with the auxiliary casing 19 and entering one end thereof, is an inlet pipe 23, the said pipe opening into the space 21 within the angular partition 18. At the other end of the auxiliary casing 19 is an outlet or discharge pipe 21 which communicates with the space within the said casing 19 and between it and the angular partition 18.

The valve 20 is the same for both pistons and is pivoted at 25 in the auxiliary casing 19 and has a curved arm portion 26 adapted to fit the outer curved surface of the partition 18. A shoe carrying portion 27 fits the other curved portion of the partition 18, the surface of which has a radial curvature with the pivot point of the valve as a center. The portion 27 forms a gate which carries a pivoted shoe 28 at its lower edge adapted to fit upon the periphery of the roller piston beneath... The valves with their gate and arm portions are made alike and are made of a proper length to fit and move between the end walls 6 of the pump cylinder and the partition 18, as indicated in Fig. 2 of the drawing. The arm portions 26 of the valves are somewhat cut away on their opposite edges as at 29 to permit the movement of liquids from beneath the said arm when they are lowered, for the trapping of liquids between the valves and the angular partition 18, would prevent a proper operation of said valves. While the valves are only made the width of the pistons it will be noted by reference to Fig. 2 that the angular partition 18 extends the full length of the pump.

In operation, the shaft 9 is rotated by any suitable power, not shown, and the eccentrics 12 and 13 turn with the said shaftand cause the roller pistons 15 and'16 to roll upon their entire peripheries around within the cylinder of the pump. As the pistons roll in the direction of the indicating arrows, liquid is drawn into the intake chamber 21 through the pipe 23 and also into the piston ripheries of the roller pistons, the gate portions 27 moving upwardly and downwardly in contact with the adjacent portion of the angular partition 18. The said valves with their shoes thus prevent the water or other liquids from moving in the wrong directions and insure the forcing of the liquids around in the cylinder from the intake to the discharge portion of the mechanism. While any desired arrangement of the pistons with respect to each other may-be had, they are usually opposite each other as indicated in Fig. 1 of the drawing, so that when the piston 15 is discharginga maximum quantity of liquid in the discharge chamber 22, the other piston 16 is drawing in a maximum supply of liquid into the inlet chamber 21 and into its portion of the cylinder. In this way the discharge pipe 24 is caused to deliver a continuous stream of liquid from the pump.

The arrangement of the gravity gate valves is such it will be noted, that the weight thereof and the weight of the water in the auxiliary casing 19, together with the hydraulic pressure of the liquid in said chamber 22 causes each valve to be held downwardly whereby the shoes 28 will at all times be held in positive contact with the peripheries of the roller pistons.

The structure of the pump secures a desired advantage in the fact that the wear will be evenly distributed upon the peripheries of the pistons, and the friction of the contacting parts will not be appreciable, thus adding to the durability and the hi h efficiency of the pump. Of course it will e understood that the minor details of the device may be considerabl varied and mechanical equivalents may he substituted all within the spirit and scope of the invention.

\Vhat is claimed is:

1. In a rotary pump, a cylindrical casing having an opening in the periphery thereof, a valve casing attached thereto and forming a cover for said opening, said valve casing having inlet and outlet chambers therein and a partition separating said chambers, one wall of said partition extending into and dividing said opening into inlet and outlet ports, a rotor eccentrically mounted in said pump casing and adapted to contact with the inner periphery thereof, and a valve pivotally supported in said valve casing and adapted to constantly engage the periphery of said rotor. as set forth.

2. In a rotary pump, a main casing having a cylindrical body, an eccentric rotor mounted therein and adapted to contact with the inner surface of said casing, a valve casing attached to the outer periphery of said main casing and having an inlet chamher and an outlet chamber therein, an opening being formed in said main casing and having communication with said inlet and outlet chambers, a partition in said valve casing having an upwardly curved portion and a downwardly curved portion, closing communication between said inlet and outlet chambers, said downwardly curved portion terminating at a point on the line of movement of said rotor, and a valve in said valve casing for engagement with said rotor.

3. In a rotary pump having a cylindrical casing and an eccentric rotor or piston therein, an opening being provided in the periphery of said casing, a valve casing attached to said cylindrical casing, covering said opening and having inlet and outlet point above said opening and a downwardly v curved portion extending into said opening and closing communication between said inlet chamber and said outlet chamber, and a valve having a curved portion conforming to the upwardly curved portion of said partition and a curved extension conforming to the downwardly curved portion of said partition and adapted to engage the periphery of said rotor, as set forth.

In testimony whereof, I have hereunto set my hand, in presence of two witnesses.

JOHN FLETCHER FORD. -Witnesses:

CAssELL SEVERANCE, EABLE R. POLLARD. 

